Question

With the code

package items;

public class itemtest {

static itemobject[] item = new items[10];
    {
    items[0] = new Toy("Example ID","Example Desc");
    items[1] = new Toy("Second Example ID", " Second Example Desc");
    }

    public static void main(String[] args) 
{
String tid = items[0].exampleiD;
 System.out.print(tid);
}
}

I get the error :

Exception in thread "main" java.lang.NullPointerException at items.itemtest.main(itemtest.java:17)

on the code line: String tid = item[0].exampleID;

Sorry I’m very new to java, could anyone shed some light on what I’m doing wrong ?

Answer 1

 {
    items[0] = new Toy("Example ID","Example Desc");
    items[1] = new Toy("Second Example ID", " Second Example Desc");
 }

You need to precede this block with the word static to have it take effect when the class is loaded — which is what you actually want to happen, based on your code — as opposed to when a new instance of itemobject is created, which never happens in your code.